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Bulletin of Botanical Research ›› 2025, Vol. 45 ›› Issue (1): 77-87.doi: 10.7525/j.issn.1673-5102.2025.01.009

• Original Paper • Previous Articles     Next Articles

Effects of Irrigation and Fertilization on Growth and Photosynthetic Physiological Characteristics of Populus cathayana × canadansis ‘Xinlin1’

Xiao LI1, Hanshi WANG1, Hongxing WANG1, Luping JIANG1, Zhongyi PANG2, Yanhui PENG2, Xiyang ZHAO1()   

  1. 1.College of Forestry and Grassland,Jilin Agricultural University,Changchun 130118
    2.Xinmin City Machinery Forest Farm,Xinmin 110300
  • Received:2024-06-28 Online:2025-01-20 Published:2025-01-23
  • Contact: Xiyang ZHAO E-mail:zhaoxyphd@163.com

Abstract:

To explore the effects of irrigation and fertilization on the growth and photosynthetic physiological characteristics of Populus cathayana × canadansis ‘Xinlin1’, and to select the optimal measures of irrigation and fertilization for promoting the growth of ‘Xinlin1’, 10-year-old ‘Xinlin1’ poplar was used as material, and four irrigation levels [-20 kPa(I20), -33 kPa(I33), -45 kPa(I45), unirrigated(I0)] and seven fertilization levels [urea 500 g?plant-1(N1), urea 1 000 g?plant-1(N2), urea 1 500 g?plant-1(N3), compound fertilizer 500 g?plant-1(F1), compound fertilizer 1 000 g?plant-1(F2), compound fertilizer 1 500 g?plant-1(F3) and control(CK)] were set to determine the height, diameter at breast height(DBH), leaf physiological and photosynthetic indexes of ‘Xinlin1’ poplar, respectively. The results showed that: (1)Irrigation and fertilization significantly increased the annual increment of DBH, tree height and volume. The highest annual increment of DBH, tree height and volume under I20 irrigation was 18.6%, 40.6% and 60.6%, respectively, compared with no irrigation. The annual increase in DBH, tree height and volume per plant under F2 fertilization were the largest, reaching 2.47 cm, 2.09 m and 0.097 m3, with an increase of 8.3%, 7.8% and 15.3% compared with no fertilization, respectively. I20F2 showed the largest growth rate, which was significantly higher than other treatments. (2)Irrigation and fertilization significantly increased chlorophyll content, soluble sugar content, soluble protein content, glutamine synthetase activity, nitrate reductase activity, net photosynthetic rate and stomata conductance. I20F2 treatment had the largest activities of soluble protein, glutamine synthetase and nitrate reductase and net photosynthetic rate. (3)Correlation analysis showed that growth traits(DBH, tree height and annual volume increase) of ‘Xinlin1’ poplar were positively correlated with leaf physiological traits and net photosynthetic rate, and negatively correlated with intercellular CO2 mole fraction. Irrigation and fertilization significantly changed the physiological characteristics of leaves, improved the photosynthetic capacity, and promoted the growth of ‘Xinlin1’ poplar. Under I20F2 treatment, the physiological indexes and net photosynthetic rate were the highest, and the tree growth reached the optimal level. Therefore, sufficient water supply(irrigation threshold was -20 kPa) and application of compound fertilizer 1 000 g?plant-1 were the optimal measures to improve photosynthetic physiological characteristics and promote the growth of ‘Xinlin1’ poplar.

Key words: poplar, fertilization, irrigation, growth traits, physiology, photosynthetic characteristics

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